* temp

game/CMakeLists.txt

@@ -12,6 +12,7 @@ set(GAME_SRC
     game_window.cpp
     renderer_simple.cpp
     renderer_shader.cpp
+    session.hpp
     
     util.cpp
     game.cpp
@@ -38,7 +39,8 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 include_directories(${OPENGL_INCLUDE_DIR})
 include_directories(${CMAKE_SOURCE_DIR}/libs/glm/)
+include_directories(${CMAKE_SOURCE_DIR}/libs/asio/asio/include/)
 
 add_executable(game ${GAME_SRC} ${GAME_HEADERS})
 setup_target(game)
-target_link_libraries(game X11 epoxy)
+target_link_libraries(game X11 epoxy pthread)

game/game.cpp

@@ -6,39 +6,56 @@
 
 #include <cmath>
 
-Game::Game() {
+Game::Game()
-    // advance simulation with 100 Hz
+{
+    // advance simulation in fixed steps with 100 Hz
     m_time_step          = 1.0 / 100.0;
     m_time_for_next_step = 0.0;
 
     m_state = new game::State();
     m_state->init();
 
-    m_state->addPlayer(0);
-    m_state->addPlayer(1);
-    m_state->addPlayer(2);
-    m_state->addPlayer(3);
-    // m_state->addPlayer(2);
 }
 
-bool Game::cycle(float dt) {
+bool Game::cycle(float dt)
+{
+#if 0
+    // XXX the following is just testing code to do things
+
+    static float total = 0.0;
     static float acc = 0.0;
+
+    //if (total == 0.0) {
+    //    float speed = 0.005;
+    //    m_state->players[0]->addCommand(new game::SetSpeedCommand(speed));
+    //    for (int i=0; i<100; i++) {
+    //        float a = 2.0 * M_PI * util::randf_0_1();
+    //        m_state->players[0]->addCommand(new game::ShootCommand(a));
+    //    }
+    //}
+    m_state->addPlayer();
+
     acc   += dt;
+    total += dt;
 
     float spawnInterval = 0.1;
     while (acc > spawnInterval) {
         acc -= spawnInterval;
 
-        float a = 2.0 * M_PI * util::randf_0_1();
+        float angle = 2.0 * M_PI * util::randf_0_1();
         float speed = 0.005;
-        m_state->players[0]->addCommand(new game::ShootCommand(a, speed));
-    }
 
-#if 1
+        m_state->players[0]->addCommand(new game::SetSpeedCommand(speed));
-    if (dt >= 10.0) {
+        m_state->players[0]->addCommand(new game::ShootCommand(angle));
-        // std::cout<<"time to big: " << dt << std::endl;
+
-        dt = m_time_step;
+        //static bool done = false;
+        //if (total >= 10.0 && !done) {
+        //    done = true;
+
+        //    m_state->players[0]->addCommand(new game::ClearTracesCommand());
+        //}
     }
+#endif
 
     // std::cout<<"adding dt: " << dt << std::endl;
     m_time_for_next_step += dt;
@@ -56,11 +73,4 @@ bool Game::cycle(float dt) {
     // steps taken." << std::endl;
 
     return true;
-#else
-    (void)dt;
-
-    m_state->advance(dt);
-
-    return true;
-#endif
 }

game/game.hpp

@@ -11,7 +11,7 @@ class Game {
     bool cycle(float dt);
 
     // for rendering
-    const game::State *state() const { return m_state; }
+    game::State *state() const { return m_state; }
 
   private:
     game::State *m_state;

game/game_window.hpp

@@ -25,12 +25,12 @@ class GameWindow : public endofthejedi::GLWindow {
         // if (!once) {
         //    once = true;
         //    for (int i=0; i<1000; i++) {
-        //        m_game.cycle(time);
+        //        m_game->cycle(time);
         //    }
         //}
 
-        if (!m_game.cycle(static_cast<float>(time / 1000000000.0))) {
+        if (!m_game->cycle(static_cast<float>(time/1000000000.0))) {
-            std::cout << "stopping the game..." << std::endl;
+            std::cout<<"stopping the game..." << std::endl;
             stop();
         }
 

game/main.cpp

@@ -1,17 +1,23 @@
-#include "opengl.hpp"
-
 #include <iostream>
 #include <getopt.h>
+#include <asio.hpp>
+#include <cstdlib>
 
+#include "opengl.hpp"
 #include "game_window.hpp"
+#include "server.hpp"
 #include "options.hpp"
 
 uint64_t optionsFlags;
 
+using asio::ip::tcp;
+
 using namespace std;
 
 int main(int argc, char *argv[]) {
 
+
+    char port[]="3490";
     char c;
 
     static struct option long_options[] =
@@ -24,7 +30,7 @@ int main(int argc, char *argv[]) {
 //        {"add",     no_argument,       0, 'a'},
 //        {"append",  no_argument,       0, 'b'},
 //        {"delete",  required_argument, 0, 'd'},
-//        {"create",  required_argument, 0, 'c'},
+          {"port",    required_argument, 0, 'p'},
           {"fps",     no_argument,       0, 'f'},
           {0, 0, 0, 0}
         };
@@ -32,7 +38,7 @@ int main(int argc, char *argv[]) {
     int option_index = 0;
 
     while(1){
-        c = getopt_long (argc, argv, "abc:d:f",
+        c = getopt_long (argc, argv, "p:f",
                        long_options, &option_index);
         if (c == -1)
             break;
@@ -42,10 +48,10 @@ int main(int argc, char *argv[]) {
             case 'f':
                 SET_FLAG(SHOW_FPS,true);
                 break;
-                /*case 'c':
+            case 'p':
-                    cvalue = optarg;
+                strcpy(port,optarg);
                 break;
-                */
+
 
             case '?':
                 /* getopt_long already printed an error message. */
@@ -56,8 +62,18 @@ int main(int argc, char *argv[]) {
         }
     }
 
-    GameWindow window(500, 500);
+    Game game;
+
+    asio::io_service io_service;
+    Server s(io_service, game.state(), atoi(port) );
+
+    GameWindow window(500, 500, &game);
     window.set_maxfps(60.0);
-    window.loop();
+
-    window.stop();
+    while(window.running()){
+        window.poll();
+        io_service.poll();
+    }
+
+    return 0;
 }

game/opengl.cpp

@@ -102,44 +102,26 @@ void endofthejedi::GLWindow::handle(XEvent event) {
 
 void endofthejedi::GLWindow::swap() { glXSwapBuffers(m_display, m_window); }
 
-void endofthejedi::GLWindow::loop() {
+void endofthejedi::GLWindow::poll() {
-    m_running = true;
 
-    timespec prev;
-    timespec current;
     clock_gettime(CLOCK_MONOTONIC_RAW, &prev);
     clock_gettime(CLOCK_MONOTONIC_RAW, &current);
 
-    double delta = 0.0;
-    double sleeptime = 0.0;
-
-    while (m_running) {
     handleevents();
     render(delta);
     swap();
 
     if (m_maxfps > 0) {
-            sleeptime = ((1000000000.0 / m_maxfps) - delta) + sleeptime;
+      sleeptime = ((1000000000.0/m_maxfps) - delta) + sleeptime;
       if (sleeptime > 0.0) {
-                usleep((unsigned int)(sleeptime / 1000.0));
+        usleep((unsigned int)(sleeptime/1000.0));
-                sleeptime = sleeptime - (unsigned int)(sleeptime / 1000.0);
+        sleeptime = sleeptime - (unsigned int)(sleeptime/1000.0);
-            }
-        }
-
-        clock_gettime(CLOCK_MONOTONIC_RAW, &current);
-        delta = diff(prev, current).tv_nsec;
-        prev = current;
-        if (delta > 0.0) {
-            m_fps = (1000000000.0 / delta);
-            if (ISSET_FLAG(SHOW_FPS)) {
-                std::cout << m_fps << "\n";
-            }
       }
     }
 }
 
 void endofthejedi::GLWindow::stop() { m_running = false; }
-
+bool endofthejedi::GLWindow::running() { return m_running; }
-void endofthejedi::GLWindow::init() {}
+void endofthejedi::GLWindow::init() { m_running = true; }
 void endofthejedi::GLWindow::render(double time) { UNUSED(time) }
 void endofthejedi::GLWindow::resize() {}

game/opengl.hpp

@@ -39,6 +39,10 @@ class GLWindow {
 
     unsigned int m_width;
     unsigned int m_height;
+    double delta = 0.0;
+    double sleeptime = 0.0;
+    timespec prev;
+    timespec current;
 
     //mainloop condition
     bool m_running = false;
@@ -47,8 +51,6 @@ class GLWindow {
     //if maxfps = 0 there's no fps limit
     double m_maxfps;
 
-    void handleevents();
-
     protected:
     //ancestors shall override these methods
     virtual void init();
@@ -61,16 +63,19 @@ class GLWindow {
     //as it handles the close calls & resizing
     virtual void handle(XEvent event);
 
+    virtual void handleevents();
+
  public:
     //initializes the X Window & creates an OpenGL context
         GLWindow(unsigned int width, unsigned int height);
         ~GLWindow();
 
     //mainloop does event handling & calls render/swap
-    void loop();
+    void poll();
     void swap();
     //stops the mainloop by setting m_running false
     void stop();
+    bool running();
 
     //getters
     unsigned int getheight() const {

game/server.hpp

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <asio.hpp>
+
+#include "session.hpp"
+
+using asio::ip::tcp;
+
+class Server
+{
+public:
+  Server(asio::io_service& io_service,game::State* s, short port)
+    : acceptor_(io_service, tcp::endpoint(tcp::v4(), port)),
+      socket_(io_service)
+  {
+    state=s;
+    do_accept();
+  }
+
+private:
+  void do_accept()
+  {
+    acceptor_.async_accept(socket_,
+        [this](std::error_code ec)
+        {
+          if (!ec)
+          {
+            std::make_shared<Session>(std::move(socket_),state)->start();
+          }
+
+          do_accept();
+        });
+  }
+
+  tcp::acceptor acceptor_;
+  tcp::socket socket_;
+  game::State* state;
+};

game/session.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <iostream>
+#include <memory>
+#include <utility>
+#include <string>
+#include <asio.hpp>
+
+#include "game.hpp"
+
+using asio::ip::tcp;
+
+class Session
+  : public std::enable_shared_from_this<Session>
+{
+public:
+  Session(tcp::socket socket, game::State* state)
+    : m_socket(std::move(socket))
+  {
+      m_state = state;
+  }
+
+  void start();
+
+private:
+    void do_read();
+    void do_write(char m_snd_data[], std::size_t length);
+    bool parse(std::string);
+    tcp::socket m_socket;
+    enum { max_length = 1024 };
+    char m_rcv_data[max_length];
+    game::State* m_state;
+    bool m_started = false;
+    int m_pid;
+};

game/state/commands.cpp

@@ -2,6 +2,8 @@
 
 #include "trace.hpp"
 
+#include <iostream>
+
 namespace game {
     void ShootCommand::apply(Player *player, State *state) const
     {
@@ -10,23 +12,72 @@ namespace game {
         // TODO: idea
         // shoot multiple rockets at once or from different positions after
         // level up / upgrade ...
-        Missile *missile = new Missile(player, player->ship->position, m_angle, m_speed);
+        Missile *missile = new Missile(player, player->ship->position, m_angle, player->speed);
 
         Trace *trace = new Trace(missile);
         missile->trace = trace;
 
-        player->energy -= m_speed;
+        player->energy -= player->speed;
         player->missiles.push_back(missile);
 
         state->addTrace(trace);
     }
 
-    bool ShootCommand::allowed(const Player *player, const State *state) const
+    bool ShootCommand::ready(const Player *player, const State *state) const
     {
         (void) state;
 
         // TODO
-        return player->alive && player->energy >= m_speed;
+        return player->alive && player->energy >= player->speed;
         //return player->alive;
     }
+
+    void ChangeNameCommand::apply(Player *player, State *state) const
+    {
+        // discard if not unique
+        for (const Player *other : state->players) {
+            if (m_name == other->name) {
+                std::cout << "name '" << m_name << "' already given to player #" << other->id << std::endl;
+                return;
+            }
+        }
+
+        player->name = m_name;
+    }
+
+    void SetSpeedCommand::apply(Player *player, State *state) const
+    {
+        (void) state;
+        player->speed = m_speed;
+    }
+
+    void ClearTracesCommand::apply(Player *player, State *state) const
+    {
+        std::cout<<"clearing traces!!!" << std::endl;
+
+        size_t i = 0;
+        while(i < state->traces.size()) {
+            Trace *trace = state->traces[i];
+            if (trace->missile == nullptr && trace->player == player) {
+                state->deleteTrace(i);
+
+            } else {
+                i++;
+            }
+        }
+    }
+
+#if 0
+    bool TakeOverPlayerCommand::ready(const Player *player, const State *state) const
+    {
+        (void) state;
+        return state->havePlayerGrantFor(player->id, m_otherPlayerId);
+    }
+
+    void TakeOverPlayerCommand::apply(Player *player, State *state) const
+    {
+        if (
+        state->playerGrant(player->id, m_otherPlayerId);
+    }
+#endif
 }

game/state/commands.hpp

@@ -9,6 +9,10 @@
 #include <iostream>
 
 namespace game {
+    /**
+     * Base class for commands.
+     * must derive from this.
+     */
     class Command {
     public:
         Command()
@@ -19,7 +23,11 @@ namespace game {
         {
         }
 
-        virtual bool allowed(const Player *player, const State *state) const
+        // check whether the command is ready to execute.
+        // if not, wait.
+        // note: stuff like for admin should be done in execute() to discard the
+        // command and not block the queue.
+        virtual bool ready(const Player *player, const State *state) const
         {
             (void) player;
             (void) state;
@@ -38,19 +46,95 @@ namespace game {
         virtual std::string name() const { return "<unnamed>"; }
     };
 
+    /**********************************************************************/
+    /* Implemented commands */
+    /**********************************************************************/
+
+    /*
+     * Shoot at angle and optional speed.
+     * TODO
+     */
     class ShootCommand : public Command {
     public:
-        ShootCommand(float angle, float speed) : m_angle(angle), m_speed(speed)
+        ShootCommand(float angle) : m_angle(angle)
         {
         }
 
         std::string name() const { return "<shoot>"; }
 
         void apply(      Player *player,       State *state) const;
-        bool allowed(const Player *player, const State *state) const;
+        bool ready(const Player *player, const State *state) const;
 
     private:
         float m_angle;
+    };
+
+    /**
+     * Change the name of the player if it will be uniuqe.
+     */
+    class ChangeNameCommand : public Command {
+    public:
+        ChangeNameCommand(const std::string &name) : m_name(name)
+        {
+        }
+
+        std::string name() const { return "<change name>"; }
+
+        void apply(Player *player, State *state) const;
+
+    private:
+        std::string m_name;
+    };
+
+    /**
+     * clear all traces of this player that are done
+     */
+    class ClearTracesCommand : public Command {
+    public:
+        ClearTracesCommand()
+        {
+        }
+
+        std::string name() const { return "<clear traces>"; }
+
+        void apply(Player *player, State *state) const;
+    };
+
+    /**
+     * Set default speed of next shots for this player.
+     */
+    class SetSpeedCommand : public Command {
+    public:
+        SetSpeedCommand(float speed) : m_speed(speed)
+        {
+        }
+
+        std::string name() const { return "<set speed>"; }
+
+        void apply(Player *player, State *state) const;
+
+    private:
         float m_speed;
     };
+
+#if 0
+    /**
+     * Take over a session for a player that left.
+     * An admin must confirm this command.
+     */
+    class TakeOverPlayerCommand : public Command {
+    public:
+        TakeOverPlayerCommand(int otherPlayerId) : m_otherPlayerId(otherPlayerId)
+        {
+        }
+
+        std::string name() const { return "<take over player>"; }
+
+        void apply(      Player *player,       State *state) const;
+        bool ready(const Player *player, const State *state) const;
+
+    private:
+        int m_otherPlayerId;
+    };
+#endif
 }

game/state/missile.cpp

@@ -49,7 +49,7 @@ namespace game {
             if (dist <= planet->radius) {
                 // TODO: collect all hits and return the first one only
                 // TODO: find exact hit position!
-                return Missile::Event(position, Hit::Planet);
+                return Missile::Event(position, planet->id);
             }
 
             dist *= 20.0;

game/state/missile.hpp

@@ -22,7 +22,8 @@ namespace game {
         // stops existing afterwards.
         class Event {
         public:
-            Event(const glm::vec2 &pos) : Event(pos, Hit::Nothing)
+            Event(const glm::vec2 &pos)
+                : Event(pos, Hit::Nothing)
             {
             }
 
@@ -31,6 +32,11 @@ namespace game {
             {
             }
 
+            Event(const glm::vec2 &pos, int planetId) : Event(pos, Hit::Planet)
+            {
+                this->planetId = planetId;
+            }
+
             Event(const glm::vec2 &pos, int playerIdKiller, int playerIdVictim)
                 : Event(pos, Hit::Ship)
             {
@@ -41,8 +47,12 @@ namespace game {
             Hit       hit;
             glm::vec2 position;
 
+            // if a player was hit, these are valid.
             int playerIdKiller;
             int playerIdVictim;
+
+            // if a planet was hit, this is valid
+            int planetId;
         };
 
         Missile(Player *player, const glm::vec2 &pos, float angle, float speed);

game/state/planet.hpp

@@ -2,11 +2,39 @@
 
 #include "object.hpp"
 
+#include <cstdlib>
+
 namespace game {
     class Planet : public Object {
     public:
-        Planet(const glm::vec2 &pos, float r) : Object(pos, r)
+        /**
+         * Planets are build out of one material.
+         * TODO: support mixture or multiple material per planet.
+         */
+        enum class Material {
+            Rock,
+            Metal,
+            Sand,
+            Gas,
+            Ice,
+            Water,
+            Sun
+        };
+
+        Planet(const glm::vec2 &pos, int id, float r) : Planet(pos, id, r, Material::Rock)
         {
         }
+
+        Planet(const glm::vec2 &pos, int id, float r, Material mat)
+            : Object(pos, r)
+            , id(id)
+            , material(mat)
+            , seed(rand())
+        {
+        }
+
+        int      id;
+        Material material; // for rendering and physics (can fly through sun and outer gas planets)
+        int      seed;     // just for rendering variation
     };
 }

game/state/player.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <string>
 #include <deque>
 #include <vector>
 
@@ -15,12 +16,14 @@ namespace game {
     public:
         int        id;
         bool       alive;
+        float      speed;
         float      energy;
         float      deadTimeCounter;
         Ship      *ship;
+        std::string name;
         std::vector<Missile*> missiles;
 
-        Player(int id) : id(id), alive(true), energy(0.0), ship(nullptr)
+        Player(int id) : id(id), alive(true), speed(0.01), energy(0.0), ship(nullptr), name("<unnamed>")
         {
         }
 

game/state/state.cpp

@@ -18,6 +18,8 @@
 
 #include "util.hpp"
 
+using namespace std;
+
 namespace game {
     void State::init()
     {
@@ -25,6 +27,7 @@ namespace game {
         m_maxMissileDistance = 2.0;
         m_playerRespawnTime  = 2.0;
         m_defaultEnergy      = 10.0;
+        m_maxNumTraces       = 10;
 
         bool planetsOnCircle = false;
 
@@ -45,7 +48,7 @@ namespace game {
                 }
             } while(glm::length(pos) < 0.2 && tries++ < 1000);
 
-            planets.push_back(new Planet(pos, 0.03 + 0.07*util::randf_0_1()));
+            planets.push_back(new Planet(pos, i, 0.03 + 0.07*util::randf_0_1()));
         }
     }
 
@@ -64,15 +67,41 @@ namespace game {
         return true;
     }
 
-    void State::addPlayer(int playerId)
+    int State::addPlayer()
     {
+        int playerId = m_nextId++;
         Player *player = new Player(playerId);
         players.push_back(player);
+        return playerId;
     }
 
-    void State::playerLeft(int playerId)
+    void State::quitPlayer(int playerId)
     {
         (void) playerId;
+        cout << playerId << " quit" << endl;
+    }
+
+    void State::clear(int playerId)
+    {
+        cout << playerId << " clear" << endl;
+    }
+
+    void State::setName(int playerId, std::string name)
+    {
+        // discard if not unique
+        for (const Player *other : players) {
+            if (name == other->name) {
+                std::cout << "name '" << name << "' already given to player #" << other->id << std::endl;
+                return;
+            }
+        }
+
+        playerForId(playerId)->name = name;
+    }
+
+    void State::setSpeed(int playerId, double speed)
+    {
+        playerForId(playerId)->speed = speed;
     }
 
     void State::advancePlayerShipSpawns(float dt)
@@ -108,7 +137,7 @@ namespace game {
             // try to execute as much queued commands as possible.
             while (player->hasCommandInQueue()) {
                 Command *command = player->peekCommand();
-                if (!command->allowed(player, this)) {
+                if (!command->ready(player, this)) {
                     break;
                 }
 
@@ -145,12 +174,9 @@ namespace game {
 
         // TODO
         // add points
-        //
+
         // TODO
         // message
-        //
-        // TODO
-        // respawn timer
     }
 
     void State::advancePlayerMissiles(float dt)
@@ -166,7 +192,9 @@ namespace game {
 
                 const bool isHit = (evt.hit != Hit::Nothing);
 
+                if (missile->trace != nullptr) {
                     missile->trace->addPointFromMissile(isHit); // force point if missile gets destroyed a
+                }
 
                 if (!isHit) {
                     i++;
@@ -192,6 +220,10 @@ namespace game {
 
                     addExplosionFromHit(&evt);
 
+                    if (missile->trace != nullptr) {
+                        missile->trace->finish();
+                    }
+
                     player->missiles.erase(player->missiles.begin() + i);
                     delete(missile);
                     //std::cout<<std::endl;
@@ -287,9 +319,50 @@ namespace game {
 
     void State::addTrace(Trace *trace)
     {
+        //int count = 0;
+        //for (Trace *old : traces) {
+        //    if (old->playerId == trace->playerId) {
+        //        count++;
+        //    }
+        //}
+
+        //if (count > m_maxNumTraces) {
+        //}
+
         traces.push_back(trace);
     }
 
+    void State::deleteTrace(size_t index)
+    {
+        if (index >= traces.size()) {
+            std::cerr << "can't find trace with invalid index " << index << std::endl;
+            return;
+        }
+
+        Trace *trace = traces[index];
+
+        //std::cout<<"removing a trace" << std::endl;
+        if (trace->missile != nullptr) {
+            // delete backlink.
+            // XXX: there's a missile without a trace now.
+            trace->missile->trace = nullptr;
+        }
+
+        traces.erase(traces.begin() + index);
+        delete(trace);
+    }
+
+    void State::deleteTrace(Trace *trace)
+    {
+        size_t i = 0;
+        while(i < traces.size()) {
+            if (traces[i] == trace) {
+                deleteTrace(i);
+                break;
+            }
+        }
+    }
+
     void State::addExplosionFromHit(const Missile::Event *evt)
     {
         if (evt->hit == Hit::Nothing || evt->hit == Hit::BorderOfUniverse) {

game/state/state.hpp

@@ -2,6 +2,7 @@
 
 #include <vector>
 #include <queue>
+#include <string>
 
 #include <iostream>
 
@@ -9,6 +10,18 @@
 
 #include "missile.hpp"
 
+// TODO:
+// give points for equipment / better weapons / more energy when:
+// - player discovers the universe
+//
+// - the shot which made a kill was much longer than the direkt line between
+//   player and his target
+//
+// - add wormholes
+// - add blackholes
+// - shoot through suns which add a fire mantle to the rocket to make it more
+//   thick and dangerous but it gets destroyed after some time.
+
 namespace game {
     // forward declarations
     class Command;
@@ -38,8 +51,11 @@ namespace game {
 
         // The upper layer (network/renderer) calling these three functions
         // should keep id's unique and give one (network) input an id.
-        void addPlayer(int playerId);
+        int addPlayer();
-        void playerLeft(int playerId);
+        void clear(int playerId);
+        void setName(int playerId, std::string name);
+        void setSpeed(int playerId, double speed);
+        void quitPlayer(int playerId);
         void commandForPlayer(int playerId, Command *cmd);
 
         // lookup. return nullptr on invalid playerId
@@ -57,6 +73,10 @@ namespace game {
         // add a trace to the list of traces.
         void addTrace(Trace *trace);
 
+        // delete traces with this command
+        void deleteTrace(Trace *trace); // using a pointer
+        void deleteTrace(size_t index); // using an index
+
         /*************************************************************************/
         /* Rendering */
         /*************************************************************************/
@@ -95,5 +115,7 @@ namespace game {
         float m_playerRespawnTime;
         float m_shipRadius;
         float m_defaultEnergy;
+        int m_nextId=0;
+        int   m_maxNumTraces;
     };
 };

game/state/trace.cpp

@@ -4,6 +4,8 @@
 
 #include "missile.hpp"
 
+#include <iostream>
+
 namespace game {
     Trace::TracePoint::TracePoint(const Missile *missile)
         : position(missile->position)
@@ -11,7 +13,16 @@ namespace game {
     {
     }
 
-    Trace::Trace(const Missile *missile) : missile(missile), fidelityCounter(0)
+    Trace::~Trace()
+    {
+        //std::cout<<"~Trace()" << std::endl;
+    }
+
+    Trace::Trace(Missile *missile)
+        : missile(missile)
+        , player(missile->player)
+        , fidelityCounter(0)
+        , age(0.0)
     {
         points.push_back(TracePoint(missile));
     }
@@ -24,4 +35,10 @@ namespace game {
             points.push_back(TracePoint(missile));
         }
     }
+
+    void Trace::finish()
+    {
+        //std::cout<<"trace finished now!" << std::endl;
+        missile = nullptr;
+    }
 }

game/state/trace.hpp

@@ -5,6 +5,7 @@
 
 namespace game {
     class Missile;
+    class Player;
 
     /*
      * Trace of a missile through the space.
@@ -12,7 +13,8 @@ namespace game {
      */
     class Trace {
         public:
-            Trace(const Missile *missile);
+            Trace(Missile *missile);
+            ~Trace();
 
             // Add the current position of the missile as a new point on the
             // trace.
@@ -21,6 +23,10 @@ namespace game {
             // the missile) in case the fidelityCounter would skip the current position.
             void addPointFromMissile(bool forceAdd=false);
 
+            // call this to mark the trace as finish and disconnect it from the
+            // missile.
+            void finish();
+
             // TODO: add extendLastPointToPosition() method for saving points /
             // optimization later on
 
@@ -35,11 +41,16 @@ namespace game {
             };
 
             std::vector<TracePoint> points;
-            const Missile *missile; // missile which creates this path.
+            Missile                *missile; // missile which creates this path.
+            Player                 *player;
 
             // counter which is incremented each time addPointFromMissile() is called.
             // when reaching a certain value the point is saved for
             // optimization.
             int fidelityCounter;
+
+            // age of the trace. if too old, it can be removed to save
+            // space/power
+            float age;
     };
 }